CVE-2026-73571: CWE-863 Incorrect Authorization in Zimbra Collaboration
An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper authorization validation in delegated email sending functionality. An authenticated attacker can send specially crafted SOAP requests to impersonate another user and send emails without possessing the required delegation or send-as permissions. This occurs in the SaveDraftRequest SOAP handler.
AI Analysis
Technical Summary
This vulnerability in Zimbra Collaboration Server before version 10.1.17 allows an authenticated attacker to bypass authorization controls in the delegated email sending feature. By sending specially crafted SOAP requests to the SaveDraftRequest handler, the attacker can impersonate other users and send emails on their behalf without proper permissions. The issue is classified under CWE-863 (Incorrect Authorization). No official patch or remediation level has been provided in the available data, and no known exploits are reported in the wild.
Potential Impact
The impact is limited to integrity, allowing an authenticated attacker to send emails impersonating other users without possessing delegation or send-as rights. There is no impact on confidentiality or availability. The CVSS score of 3.1 reflects this low-severity impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict authenticated user permissions carefully and monitor for suspicious delegated email sending activity. No vendor advisory or patch links are currently provided.
CVE-2026-73571: CWE-863 Incorrect Authorization in Zimbra Collaboration
Description
An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper authorization validation in delegated email sending functionality. An authenticated attacker can send specially crafted SOAP requests to impersonate another user and send emails without possessing the required delegation or send-as permissions. This occurs in the SaveDraftRequest SOAP handler.
CVSS v3.1
Score 3.1low
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Zimbra Collaboration Server before version 10.1.17 allows an authenticated attacker to bypass authorization controls in the delegated email sending feature. By sending specially crafted SOAP requests to the SaveDraftRequest handler, the attacker can impersonate other users and send emails on their behalf without proper permissions. The issue is classified under CWE-863 (Incorrect Authorization). No official patch or remediation level has been provided in the available data, and no known exploits are reported in the wild.
Potential Impact
The impact is limited to integrity, allowing an authenticated attacker to send emails impersonating other users without possessing delegation or send-as rights. There is no impact on confidentiality or availability. The CVSS score of 3.1 reflects this low-severity impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict authenticated user permissions carefully and monitor for suspicious delegated email sending activity. No vendor advisory or patch links are currently provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-08-12T21:49:11.961Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7de5d0bf8831d5396651bc
Added to database: 08/13/2026, 15:42:08 UTC
Last enriched: 08/13/2026, 15:58:36 UTC
Last updated: 08/13/2026, 16:38:20 UTC
Views: 4
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